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Responsiveness Summary For The Remedial Action Plan Rough and Ready Island, Stockton, California October 18, 2023 Page 2 of 2 3) Existing Durable Cover, Fence, and IC, 4) Excavation (2 feet) with Off-Site Disposal, Cover, and IC, and 5) Expanded Excavation, Consolidation, Cover, and IC). The five remedial alternatives were evaluated and then compared with the nine federal criteria from Environmental Protection Agency guidance to ensure compliance with the nine federal criteria. The RAP recommends Alternative 5 (Expanded Excavation with On-Site Consolidation, Existing Durable Cover, Expanded New Durable Cover, and IC). Alternative 5 is the most effective and viable alternative because it will support a proposed development (called Project Sierra) with near-term economic benefits to the region. Alternative 5 involves installing a durable cover that is integrated with the Project Sierra development, maintaining the cover over time, and establishing ICs to restrict future land use. This will be completed in two phases. During Phase 1, 57,000 cubic yards of contaminated soil will be excavated and consolidated under a new proposed future warehouse. The warehouse will be two feet above the surface to accommodate the consolidated soil. The remaining areas will be covered with either asphalt or concrete. Unpaved areas will be covered with a demarcation layer and two feet of clean soil. The existing and new covers will be inspected and maintained, and future land use and activities will be restricted through a land use covenant. The 2003 Consent Agreement indicates the State will comply with the CEQA for all activities that are "projects" as defined by CEQA. The 2003 Consent Agreement also indicates the Port will prepare any necessary CEQA documents. On January 11, 2022, the Port released the draft Development Warehousing and Distribution Facility Project Environmental Impact Report (EIR) that described and analyzed the proposed remedial alternative and the planned Project Sierra development. The Port is finalizing the EIR, which will include responses to comments received on the draft EIR. No changes to the proposed remedial alternative were required based on comments received on the draft EIR. Provided the alternative selected following public review of the draft RAP is not substantially different from that presented in the draft RAP, DTSC will rely on the EIR to comply with CEQA. The draft EIR is available on DTSC's EnviroStor website (https://www.envirostor.dtsc.ca.gov/public/profile report?global id=39420010). DTSC, as a Responsible Agency under CEQA and Lead Agency for the remedial action, will file a Notice of Determination with the State Clearinghouse.